Giant g-factor in Self-Intercalated 2D TaS₂

Area of Science:

• Materials Science
• Condensed Matter Physics
• Spintronics

Background:

• The Landé g-factor is crucial for manipulating spins in spintronic devices using electric and magnetic fields.
• Enhancing the g-factor is key to advancing spintronic applications.

Purpose of the Study:

• To investigate self-intercalation as a strategy to enhance the Landé g-factor in transition metal dichalcogenides.
• To explore the electronic structure and magnetic properties of self-intercalated 2H-TaS2.

Main Methods:

• Scanning tunneling microscopy (STM) for structural characterization.
• Scanning tunneling spectroscopy (STS) for electronic structure and g-factor determination.
• Analysis of density of states (DOS) and magnetic field sensitivity.

Main Results:

• A self-intercalated phase, Ta7S12, was synthesized and characterized.
• A sharp density of states peak at the Fermi level indicates Stoner criteria fulfillment for ferromagnetism.
• An effective g-factor of approximately 77 was measured, showing sensitivity to magnetic fields.

Conclusions:

• Self-intercalation of transition metal dichalcogenides with native metal atoms is a viable strategy to enhance the Landé g-factor.
• Interlayer charge transfer in Ta7S12 induces ferromagnetic instability and spin-split states.
• This approach offers a new pathway for tuning g-factors in materials for spintronics.